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     * Helper method for recursively building a parse tree.
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     * Helper method for recursively building a parse tree.
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     *
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     *
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     * @throws Mustache_Exception_SyntaxException when nesting errors or mismatched section tags are encountered
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     * @throws Mustache_Exception_SyntaxException when nesting errors or mismatched section tags are encountered
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     *
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     *
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     * @param array &$tokens Set of Mustache tokens
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     * @param array &$tokens Set of Mustache tokens
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     * @param array $parent  Parent token (default: null)
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     * @param ?array $parent  Parent token (default: null)
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     *
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     *
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     * @return array Mustache Token parse tree
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     * @return array Mustache Token parse tree
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     */
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     */
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    private function buildTree(array &$tokens, array $parent = null)
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    private function buildTree(array &$tokens, ?array $parent = null)
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    {
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    {
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        $nodes = array();
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        $nodes = array();
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        while (!empty($tokens)) {
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        while (!empty($tokens)) {